Factors controlling the development of tight sandstone reservoirs in the Huagang Formation of the central inverted structural belt in Xihu sag, East China Sea Basin

Xu, Fanghao; Xu, Guoce; Liu, Yong; Zhang, Wu; Cui, Hengyuan

doi:10.1016/s1876-3804(20)60009-x

Cited by 27 publications

(9 citation statements)

References 5 publications

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“…The carbonate cementation mainly involved the calcite, dolomite, ferro calcite, ferrodolomite ( Fig. 4D-F), and ankerite is a sign of late diagenetic stage 16 . In consideration of formation temperature (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In the past five decades, lots of oil and gas fields and structures have been discovered in the exploration of Xihu sag of the East China Sea Basin. For the sandstone reservoir of the E 3 h Formation, previous scholars mainly focused on the following aspects: (1) lithologic features, diagenetic environment evolution and controlling factors of the Oligocene Huagang formation tight sandstone on the central inverted structural belt 25 – 28 ; (2) the tectonic activities on diagenetic and reservoir-forming process in the Upper section of Huagang formation, including how tectonic activities controlled the differential burial process and hydrocarbon generation history of source rock , and how fracture systems connect source rocks with reservoirs on the central inverted structural belt 22 , 29 – 31 ; and (3) sedimentary source and sedimentary environment changing through space and time 16 , 32 , 33 . However, the limited offshore geologic data restricted offshore oil and gas exploration in the deep formation.…”

Section: Introductionmentioning

confidence: 99%

“…The recognization that diagenetic evolution has the characteristics of stages [14][15][16][17] has already begun in the early 1970s, and Schmidt and Morad (1979) 18 first put forward the division basis and naming method of diagenetic stages. Domestic scholars have also proposed the division standard of diagenetic stages of clastic rocks on basis of previous research 11,19,20 (Table 1).…”

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Diagenetic evolution of the Oligocene Huagang Formation in Xihu sag, the East China Sea Shelf Basin

Qian

Yin

Zhang

et al. 2020

Sci Rep

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The deep and ultra deep clastic reservoir is characterized by strong reservoir heterogeneity and complicated reservoir-forming characteristics for its high degree of diagenetic stage and the complexity of diagenesis. In order to better study the diagenetic evolution of deep and ultra deep reservoir in the burial process, a fine subsection scheme of 36 diagenetic micro-stage (DS) in diageneitic process was proposed based on paleotemperature (T), vitrinite reflectance (Ro%) and proportion of smectite in illite/smectite interstratified minerals (I/S-S%). Taking the Oligocene Huagang Formation in the Xihu sag of the East China Sea Basin as an example, the diagentic stage IIA1–IIA2–IIB was identified mainly by means of formation temperature data (T), homogenization temperature of fluid inclusion (Th), vitrinite analysis and clay mineral X-ray diffraction method. On this basis, diagenetic evolution using the fine subsection scheme in geological time were conducted. This fine division of diagenetic stage could bring accurate insight into porosity evolution history, hydrocarbon charging periods, diagenetic and reservoir-forming characteristics of low-permeability and tight sandstone.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Diagenetic evolution of the Oligocene Huagang Formation in Xihu sag, the East China Sea Shelf Basin

Qian

Yin

Zhang

et al. 2020

Sci Rep

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“…In the study block, the Gs formation is a set of fluvial-lacustrine strata, and the sedimentary environment mainly consists of a fluvial delta system. The lithology of the Gs formation is complex, and mud intercalation and a small amount of glutenite are developed within a large set of sandstones [20,21]. A considerable part of Gs formation is a tight sandstone reservoir.…”

Section: Study Areamentioning

confidence: 99%

Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

Jiang

Jian

et al. 2021

Geofluids

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Complex characteristics exist in the resistivity response of Gs reservoirs in the central inversion belt of the Xihu Sag, East China Sea Basin. Some drilling wells have confirmed the existence of abnormally low resistivity in gas reservoirs of the area; and the electrical logging response was unable to reflect fluid properties of the reservoir accurately. Therefore, it is necessary to analyze the origin of the low resistivity and determine its controlling factors. Based on experimental data of core analysis and numerical simulations of mud invasion, this study thoroughly explores the origin of low resistivity in the subject gas-bearing reservoir considering both internal and external factors. The results indicated that when there is no or a low degree of mud invasion, the fine lithology, complex pore structure, additional clay mineral conductivity, and high content of pyrite are the main internal factors driving the conditions present in the studied gas reservoir. When mud invasion occurs, the invasion of highly saline mud is the main external cause of low resistivity. The numerical simulation results indicated that a formation with good permeability and high overbalance pressure has a deep invasion depth. The resistivity around the well is obviously reduced after the invasion, and low resistivity would form easily. Combined with actual data of several wells, the main influencing factors of the reservoir’s electrical characteristics were analyzed, and the main controlling factors of low resistivity in the gas reservoirs are given. This study provides valuable support for studying the low-contrast complex reservoir conductivity mechanism. The study also offers novel ideas for accurate calculation of saturation and the meticulous evaluation of reservoir for subsequent studies.

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“…Recent oil and gas discoveries showed that lithology and structure-lithologic reservoirs are new directions for further exploration breakthroughs in this basin . In recent years, increasing attention has been paid to the study of Paleocene tight sandstone reservoirs in the East China Sea Shelf Basin, and fruitful studies have been carried out on the genesis and reservoir distribution prediction of the tight sandstone reservoirs in the East China Sea Shelf Basin from the perspectives of deposition, diagenesis, and accumulation. − However, the pore structure of tight sandstone remains to be further studied. Lishui Sag, located in the south of the East China Sea Shelf Basin, has been the site of productive comprehensive research and exploration of petroleum geology in the past 10 years and is an important oil and gas strategic area for the development of unconventional tight sandstone reservoirs in the basin. , The study of the characteristics of tight sandstone reservoirs in Lishui Sag will provide an important reference for the study on the characteristics of tight sandstone reservoirs in the East China Sea Shelf Basin and even the whole western Pacific region.…”

Section: Introductionmentioning

confidence: 99%

Pore-Throat Size Distribution and Classification of the Paleogene Tight Sandstone in Lishui Sag, East China Sea Shelf Basin, China

Zhao

Ma³

2020

Energy Fuels

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The characteristics of tight sandstone reservoirs are closely influenced by the complex pore structure and the widths of pore-throat size distributions (P-TSDs). Because of the limitations of various techniques, it is difficult to characterize the morphology and size distribution jointly of the pore-throat structure. In this study, thin section, scanning electron microscopy, X-ray fluorescence diffraction, high-pressure mercury injection, and constant speed mercury injection were combined to analyze the pore throat structure characteristics of the Lishui tight sandstone reservoir in the southern East China Sea Shelf Basin, and joint characterization of morphology and size distribution of the pore-throat structure was established based on X-ray computed tomography (XCT) analysis. The results showed that the Paleocene tight sandstone in Lishui Sag generally has a high content of lithic and feldspar, which provides a good material basis for the development of clay minerals in the reservoir. Autogenic illite and kaolinite occupy the majority of pore-throat space in tight sandstone reservoirs and form intergranular micropores of clay minerals with a radius less than 1 μm, which are important factors for the development of micropores and throats in tight sandstone. XCT scanning showed that as the content of clay mineral increased, the number of throats developed per unit volume decreased, the isolated point-like micropores significantly increased, and the connectivity between micropores deteriorated. Based on the pore and throat information obtained by XCT scanning, the pore and throat radius frequency and volume distribution curves were generated. According to the distribution characteristics of the curves, the pore size distribution types of tight sandstone are divided into two types: peak type and flat type, and throat size distribution types are divided into three types: right peak type, left peak type, and bimodal type.

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Factors controlling the development of tight sandstone reservoirs in the Huagang Formation of the central inverted structural belt in Xihu sag, East China Sea Basin

Cited by 27 publications

References 5 publications

Diagenetic evolution of the Oligocene Huagang Formation in Xihu sag, the East China Sea Shelf Basin

Diagenetic evolution of the Oligocene Huagang Formation in Xihu sag, the East China Sea Shelf Basin

Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

Pore-Throat Size Distribution and Classification of the Paleogene Tight Sandstone in Lishui Sag, East China Sea Shelf Basin, China

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